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DTC P18A4:00 [PCM (SKYACTIV-G)]

id0102t4977200

Outline

System malfunction location

PCM i-ACTIV AWD control system

Detection condition

•  A condition in which the difference between the target current of the AWD solenoid control current and the actual current is the specification or more continues.

Fail-safe

•  Inhibits the i-ACTIV AWD control.

Possible cause

•  i-ACTIV AWD system-related part connector or terminal malfunction

•  AWD solenoid malfunction

•  Electrical supply unit (ESU) malfunction

•  PCM malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

System malfunction location	PCM i-ACTIV AWD control system
Detection condition	• A condition in which the difference between the target current of the AWD solenoid control current and the actual current is the specification or more continues.
Fail-safe	• Inhibits the i-ACTIV AWD control.
Possible cause	• i-ACTIV AWD system-related part connector or terminal malfunction • AWD solenoid malfunction • Electrical supply unit (ESU) malfunction • PCM malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

•  Record the freeze frame data/snapshot data.

Note

•  Recording can be facilitated using the screen capture function of the PC.

—

Go to the next step.

2

VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY

•  Verify related Service Bulletins, on-line repair information, or Service Information availability.

•  Is any related Information available?

Yes

Perform repair or diagnosis according to the available information.

•  If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

ALLOW THE VEHICLE TO COOL DOWN FOR WHILE

•  Switch the ignition to off and allow vehicle to cool down.

—

Go to the next step.

4

INSPECT i-ACTIV AWD SYSTEM-RELATED PART CONNECTORS FOR MALFUNCTION

•  Inspect the following connectors and terminals.
(See CONNECTOR INSPECTION.)

―  Coupling component temperature sensor

―  Differential oil temperature sensor

―  AWD solenoid

―  Electrical supply unit (ESU)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

5

INSPECT AWD SOLENOID FOR MALFUNCTION

•  Inspect the applicable part.
(See AWD SOLENOID INSPECTION.)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See COUPLING COMPONENT REMOVAL/INSTALLATION [(E)].)

6

VERIFY ELECTRICAL SUPPLY UNIT (ESU) DTCs

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Are any electrical supply unit (ESU) DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)

No

Go to the next step.

7

INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR MALFUNCTION

•  Inspect the following connectors and terminals.
(See ELECTRICAL SUPPLY UNIT (ESU) INSPECTION.)

―  Coupling component temperature sensor

―  Differential oil temperature sensor

―  AWD solenoid

•  Are all the connectors and terminals normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

―  Switch the ignition ON (engine off)

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].)

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	ALLOW THE VEHICLE TO COOL DOWN FOR WHILE • Switch the ignition to off and allow vehicle to cool down.	—	Go to the next step.
4	INSPECT i-ACTIV AWD SYSTEM-RELATED PART CONNECTORS FOR MALFUNCTION • Inspect the following connectors and terminals. (See CONNECTOR INSPECTION.) ― Coupling component temperature sensor ― Differential oil temperature sensor ― AWD solenoid ― Electrical supply unit (ESU) • Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT AWD SOLENOID FOR MALFUNCTION • Inspect the applicable part. (See AWD SOLENOID INSPECTION.) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See COUPLING COMPONENT REMOVAL/INSTALLATION [(E)].)
6	VERIFY ELECTRICAL SUPPLY UNIT (ESU) DTCs • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Are any electrical supply unit (ESU) DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
6		No	Go to the next step.
7	INSPECT ELECTRICAL SUPPLY UNIT (ESU) FOR MALFUNCTION • Inspect the following connectors and terminals. (See ELECTRICAL SUPPLY UNIT (ESU) INSPECTION.) ― Coupling component temperature sensor ― Differential oil temperature sensor ― AWD solenoid • Are all the connectors and terminals normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Switch the ignition ON (engine off) • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (E))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (E))].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.